TIME MEASUEED BY ALLUVIUM. 



U3 



ice, we can then estimate the amount of time which has elapsed 

 since the glacial epoch. This vague period, which according to 

 various geologists comprehends thousands or millions of years, will 



Pig. 55.— Ancient Fjords of Carentan. 



assume, at least for the times nearest to us, a more precise mean- 

 ing, and will arrange itself like the centuries in the chronology of 

 mankind. 



